import { Component, OnInit } from '@angular/core';
import { Router } from '@angular/router';

import { Observable } from 'rxjs/Observable';
import { Subject } from 'rxjs/Subject';

import 'rxjs/add/observable/of';
import 'rxjs/add/operator/catch';
import 'rxjs/add/operator/debounceTime';
import 'rxjs/add/operator/distinctUntilChanged';

import { HeroSearchService } from './herosearch.service';
import { Hero } from './app.hero';


@Component({
    selector: "herosearch",
    styleUrls: ['./app.component.css'],
    templateUrl: './herosearch.component.html',
    providers: [HeroSearchService]
})
export class HeroSearchComponent implements OnInit {

    heroes: Observable<Hero[]>;
    private searchTerms = new Subject<string>();

    constructor(private heroSearchService: HeroSearchService, private router: Router) {

    }

    search(term: string): void {
        this.searchTerms.next(term);
    }

    ngOnInit() {

        this.heroes = this.searchTerms.debounceTime(300)
            .distinctUntilChanged()
            .switchMap(term => term ? this.heroSearchService.search(term) : Observable.of<Hero[]>([]))
            .catch(err => {
                console.log(err);
                return Observable.of<Hero[]>([]);
            });
    }

    gotoDetail(hero: Hero): void {
        let link = ['/detail', hero.id];
        this.router.navigate(link);
    }

}
